Water ingress into unbonded post-tensioning tendons can lead to serious and expensive structural problems. The severity of this condition can be difficult to detect as often there are limited signs of distress until one or more tendons have lost tension as a result of section loss from corrosion. This paper presents a case study illustrating the investigation and the rehabilitation of tendon failures in a two-way, unbonded post-tensioned roof slab. Techniques for identifying deficiencies with the tendons are summarized as well as the proprietary cable drying procedure that was used for tendon rehabilitation. The authors' observations regarding the effectiveness of the tendon drying based upon continued monitoring of the structure are presented.
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